(Make sure to enable ZRoot Datapack if you are using 1.17+)

To Craft It(Floor Craft):-
-32 Redstone Block
-64 Crying Obsidian
-12 Magma Cream
-12 Netherwart
-2 Netherite Ingots


Put those together and you will get a Knuckles Head. Put the Head on to get Knuckles' abilities:-

-In his First slot Knuckles has his Attack Rush. (Hold Shift to break blocks with it)
Pressing F lets out a Flurry of Blows

-In his Second Slot Knuckles has a quick jab(Hold Shift to unlock full power jab)
Pressing F gives a quick jab that has a small stun
Holding Shift and Pressing F does a full power jab that is enough to kill most normal enemies.

-In his Third Slot Knuckles can
Press F while on the ground to burrow, You burrow down and appear foward
Press F while mid air to glide, Press F again to stop gliding

-In his Fourth slot is his Treasure Sense. To use it you need to be standing on smooth stone.
Press F and all stone around you will turn invisible.(Basically an X-Ray) Press F again to go back to normal